/*
    * First: pluck to extract all attributes_combinations from the items variations array
    * Second: union to join all arrays into one array of arrays
    * Third flattenDeep to make an array of arrays into an array
    * by now I have an array with all the attributes the item has available
    * Fourth: Remove duplicate attributes
    * Fifth: countBy 'name' to count how many different attributes names we have for each variation type
    * Example variations_count = {
    *   'Color Primario': 2 //It has 2 Color Primario available (blue and white)
    *   'Color Secundario': 1 //It has 1 Color Secundario available (only black)
    *   'Talle': 3 //It has 3 sizes available
    * }
    */

    var variations_count = _.countBy(_.unique(_.flattenDeep(_.union(_.pluck(fullItem.variations, 'attribute_combinations'))), 'value_name'), 'name');